Processing Method for Making Electronic Documents Secure

1. A processing method performed by a system comprising a first processor unit in a first terminal, a second processor unit in a remote authentication server, and a third processor unit in a mobile telephone, to enable a user to access sensitive text data from a secure electronic document, the method comprising: a) the first processor unit obtaining the secure electronic document; b) the first processor unit triggering a display of the secure electronic document on the first terminal; c) the user selecting at least one marker that is contained in said secure electronic document and that is viewable by the user on a display of the first terminal, wherein: each marker of the at least one marker comprises a first identifier and a machine-readable code, and the at least one marker is selected by said third processor unit under user control when the at least one marker displayed on the first terminal is viewed by a camera device in the mobile telephone controlled by the third processor unit; c′) sending, by the third processor unit, the at least one selected marker to the second processor unit; d) on the basis of said at least one received marker, determining, by said second processor unit, secure data from which it is possible to recover at least one item of sensitive text data, wherein said secure data is recovered from outside said secure electronic document; f) the second processor unit determining said at least one item of sensitive text data for viewing from said secure data and transmitting determined data to the third processor unit, wherein the second processor unit transmitting the determined data to the third processor unit comprises: the first processor unit searching in a vicinity of the first terminal using wireless communication means; the first processor unit receiving a second identifier of the mobile telephone when it is in a detection field of the wireless communication means; and the first processor unit transmitting the second identifier to the remote authentication server, wherein the second processor unit identifies the mobile telephone to which the determined data is to be transmitted on the basis of the second identifier; g) the third processor unit obtaining said at least one item of sensitive text data; and h) the third processor unit triggering a display of said at least one item of sensitive text data.

2. A method according to claim 1 , wherein the obtaining step a) further comprises: the first processor unit receiving the secure electronic document from outside said first terminal.

3. A method according to claim 1 , wherein the secure data is a third identifier, and wherein said at least one item of sensitive text data is determined in step f) from a file that is accessible to said second processor unit, said file comprising at least one identifier in association with said at least one item of sensitive text data.

4. A method according to claim 1 , wherein the secure data comprises the at least one item of sensitive text data in encrypted form, said determination in step f) comprising decrypting said secure data in order to deduce said at least one item of sensitive text data therefrom.

5. A method according to claim 1 , wherein the third processor unit selects each of the at least one marker viewed by means of said camera device for a determined duration continuously.

6. A method according to claim 1 , wherein the determined data comprises the at least one item of sensitive text data encrypted using a first cryptographic key, the at least one item of sensitive text data being obtained by the third processor unit in step g) by decrypting said determined data using a second cryptographic key matching said first cryptographic key.

7. A method according to claim 1 , wherein the selection step c) is performed by means of a pointer that can be seen in the display of step b) on the first terminal, and that can be controlled by the user by means of an interface of the first terminal, said pointer being configured to change its visual appearance during said display when it enters a region of the secure electronic document that corresponds to said at least one marker.

8. A method according to claim 1 , including the following steps before the obtaining step a) which steps are performed by a fourth processor unit: i) obtaining an initial electronic document; j) determining in said initial electronic document the at least one item of sensitive text data that is to be made secure; k) generating the secure data from said at least one item of sensitive text data; and l) processing said initial electronic document in order to obtain the secure electronic document by including in the initial electronic document the at least one marker associated with said secure data, and by deleting or masking the at least one item of sensitive text data.

9. A method according to claim 8 , wherein said processing step l) further comprises including said secure data in the initial electronic document.

10. A method according to claim 8 , wherein said determination step j) comprises: displaying said initial electronic document; and the fourth processor unit, under the control of a user, selecting the at least one item of sensitive text data that is to be made secure.

11. A method according to claim 8 , wherein the initial electronic document comprises a sequence of successive items of text data in a determined order, the at least one marker being inserted by the fourth processor unit into the initial electronic document during said processing step l) such that when the secure electronic document is displayed in step b), the at least one marker replaces said at least one item of sensitive text data in said sequence of successive items of text data.

12. A method according to claim 8 , wherein the processing of step l) further comprises: deleting or masking, in the secure electronic document, at least 70% of text data initially contained in the initial electronic document.